Do you mean something like having one opamp handle bass and another mid-range and treble on the same channel or having completely separate opamps on opposite left and right channels?
The first would probably have some pretty funky issues around the frequency cut-off of the filter but might produce interesting results if accuracy isn't a goal. You can stop them fighting each other by sticking a 1-2ohm (occasionally might need slightly higher for some opamps) resistor on the output of each where they combine.
The other there are various takes on like the pseudo-balanced amplifier someone on here built - I also separately built my own variant of it using dual isolated power supplies, etc.
Wow! That’s impressive that someone here built two isolated powered channels.
Pseudo-balanced idea seems interesting and maybe perfected with the right software algorithms that are custom made per channel. That would require some hardcore software engineering skills.
The pseudo surround sounds I’ve encountered on the software side all sound artificial but there are some that get it right like Cowon.
... basically wanted to put a opa2228 on one channel and AD8620 on the another. (Left + Right)
Off the top of my head the only thing I can see as a logical problem would be that if the op amps aren’t close in specs there could be a time issue with latency. However, as a byproduct it could be a nice experiment to A/B Test in each ear which op amp would sound better??
As long as nothing hardware-wise is being compromised, it seems like a harmless way to experiment but I’m certainly not sure to say so with absolute certainty to all.
I would imagine that you’d have put two op amps that are of = Class A, B, etc. on separate stereo channels in the same stage. (Would imagine it sounded funky otherwise unless it’s so minimal that your ears don’t detect any difference)
Many modern discrete op amps don’t draw a lot of current so if the range of both different op amps are of = value energy consumption it should be a problem.
As far the “warm” or “bright”, etc it is my belief that this is determined by how the op amp feature or highlight certain frequencies and how they tuned. This is how sound engineers mix audio tracks.
All things equal a great firmware that integrate with a high performance op amp with a wide bandwidth will sound ANYWAY you want. Lots of Diyers find this difficult to accept since they only tend to focus to the “Analog” part of the Digital-to-Analog converters.
Lots of sound issues are really a factor of how well your clocks are, how the upsampling and if there errors in the binary info of the files.
